as advised by many, it is not a wise move to use centralised exchanges even if it is a reputable exchange to store your crypto. why not download and install your own wallet like electrum? if a dentist or any other medical professional wants to be paid by crypto, they can easily search now via internet. they are well educated people so reading over the net is no problem with them. though they can make mistake in choosing a trading platform. but better to store their funds in a non-custodial wallet where they have full control of their funds. they can easily generate their address and post it.
people will also get curious with btc or crypto if they have something like that posted on their office doors.

Dentist are typically old-fashion, it's already hard to sell them basic Facebook ads that would obviously increase their revenue. I think your best bet is to find someone that is already interested/knows about crypto, rather than trying to convince someone from the start.

Start a survey if you want to educate dentists and give them an idea about payments in the form of cryptocurrencies. It's the hardest part especially if many of them isn't aware of it.
I'm sure that they don't want to spend any money on this technology if they just hear it out and still trying to understand. That's how most of them are wise when it comes to finance although they're on the different field because I've known several dentists and they can't really be outsmart. But many of them can also be open to the new ideas that they've probably just heard.